7x+3x=-21

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Solution for 7x+3x=-21 equation: 



7x+3x=-21

We move all terms to the left:

7x+3x-(-21)=0

We add all the numbers together, and all the variables

10x+21=0

We move all terms containing x to the left, all other terms to the right

10x=-21

x=-21/10

x=-2+1/10

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